Measurement of tracer gas distributions using an open-path FTIR system coupled with computed tomography

Anushka C. Drescher; Michael G. Yost; Doo Yong Park; Steven P. Levine; Ashok J. Gadgil; Marc L. Fischer; William W. Nazaroff

doi:10.1117/12.210787

31 May 1995 Measurement of tracer gas distributions using an open-path FTIR system coupled with computed tomography

Anushka C. Drescher, Michael G. Yost, Doo Yong Park, Steven P. Levine, Ashok J. Gadgil, Marc L. Fischer, William W. Nazaroff

Author Affiliations +

Proceedings Volume 2365, Optical Sensing for Environmental and Process Monitoring; (1995) https://doi.org/10.1117/12.210787
Event: Optical Sensing for Environmental and Process Monitoring, 1994, McLean, VA, United States

Abstract

Optical remote sensing and iterative computed tomography (CT) can be combined to measure the spatial distribution of gaseous pollutant concentrations in a plane. We have conducted chamber experiments to test this combination of techniques using an Open Path Fourier Transform Infrared Spectrometer (OP-FTIR) and a standard algebraic reconstruction technique (ART). ART was found to converge to solutions that showed excellent agreement with the ray integral concentrations measured by the FTIR but were inconsistent with simultaneously gathered point sample concentration measurements. A new CT method was developed based on (a) the superposition of bivariate Gaussians to model the concentration distribution and (b) a simulated annealing minimization routine to find the parameters of the Gaussians that resulted in the best fit to the ray integral concentration data. This new method, named smooth basis function minimization (SBFM) generated reconstructions that agreed well, both qualitatively and quantitatively, with the concentration profiles generated from point sampling. We present one set of illustrative experimental data to compare the performance of ART and SBFM.

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Anushka C. Drescher, Michael G. Yost, Doo Yong Park, Steven P. Levine, Ashok J. Gadgil, Marc L. Fischer, and William W. Nazaroff "Measurement of tracer gas distributions using an open-path FTIR system coupled with computed tomography", Proc. SPIE 2365, Optical Sensing for Environmental and Process Monitoring, (31 May 1995); https://doi.org/10.1117/12.210787

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